package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealDishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class DishServiceImpl extends ServiceImpl<DishMapper,Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;
    @Autowired
    private SetmealDishService setmealDishService;
    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到菜品表dish
        this.save(dishDto);

        Long dishId = dishDto.getId();//菜品id

        //菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        //保存菜品口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);

    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish,dishDto);

        //查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);
        dishDto.setFlavors(flavors);

        return dishDto;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        //更新dish表基本信息
        this.updateById(dishDto);

        //清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());

        dishFlavorService.remove(queryWrapper);

        //添加当前提交过来的口味数据---dish_flavor表的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();

        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 更新批量停售、起售
     * @param status
     * @param ids
     */
    @Override
    public void updateStatusByIds(Integer status, List<Long> ids) {
//        构造一个套餐的条件查询器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper();
//        条件查询到具体的套餐
        queryWrapper.in(ids !=null,Dish::getId,ids);
//        菜品根据套餐的条件查询
        List<Dish> list = this.list(queryWrapper);
        for(Dish dish: list)
        {
            if(dish !=null)
            {
                dish.setStatus(status);
                this.updateById(dish);
            }
        }

    }


    /**
     * 删除菜品，同时需要删除菜品和对应的口味的关联数据
     * @param ids
     */
    @Transactional
    @Override
    public void removeWithFlavor(List<Long> ids) {
        //select count(*) from dish where id in (1,2,3) and status = 1
        //查询菜品状态，确定是否可用删除
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Dish::getId,ids);
        queryWrapper.eq(Dish::getStatus,1);
        int count = super.count(queryWrapper);
        if (count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("菜品正在售卖中，不能删除");
        }
        //查询菜品是否被包含在套餐中，确认是否可删除
        LambdaQueryWrapper<SetmealDish> setmealDishQueryWrapper = new
                LambdaQueryWrapper<>();
        setmealDishQueryWrapper.in(SetmealDish::getDishId,ids);
        SetmealDish one = setmealDishService.getOne(setmealDishQueryWrapper);

        if (one != null){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("菜品包含在某个套餐中，不能删除");
        }

        //如果可以删除，先删除菜品表中的数据---dish
        super.removeByIds(ids);

        //再查询口味表中对应菜品id的口味信息并删除
        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(DishFlavor::getDishId,ids);
        //删除关系表中的数据---dish_flavor
        dishFlavorService.remove(lambdaQueryWrapper);
    }
}
